Thomas Stewart "Tom" Udall (born May 18, 1948) is the junior United States Senator from New Mexico and a member of the Democratic Party. He had represented New Mexico's 3rd congressional district as a member of the United States House of Representatives since 1999. Udall was elected as the junior United States senator from New Mexico on November 4, 2008, defeating Congressman Steve Pearce. He is expected to become the state's senior senator when Jeff Bingaman retires from the Senate in January 2013.

Tom Udall's family can be traced to territorial New Mexico, and he was born in Tucson, Arizona. He attended Prescott College, graduating with a pre-law degree in 1970. In 1975, he graduated from Cambridge University in England with a Bachelor of Law degree. That fall, he enrolled in the University of New Mexico School of Law and graduated with a Juris Doctor in 1977. After graduating, Udall was Law Clerk to Chief Judge Oliver Seth of the Tenth Circuit Court of Appeals. His legal career then included appointments as Assistant US Attorney in the criminal division and Chief Counsel to the Department of Health and Environment. A partnership followed in the Miller Law Firm.

He is the son of Stewart Udall, who was Secretary of the Interior from 1961 to 1969, nephew of Arizona Congressman Morris Udall, and first cousin of Colorado Senator Mark Udall, double second cousin of former Oregon Senator Gordon Smith, and second cousin of Utah Senator Mike Lee. He was baptized in the Church of Jesus Christ of Latter-day Saints.

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